Malicious PDF — malware analysis report

Static analysis result for SHA-256 e028ed0ab22e1450…

MALICIOUS

PDF

48.5 KB Created: 2021-06-10 22:00:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 9ceccc88bcec00b5ac07de37f3a16834 SHA-1: ad326d23ada53eec5069de533596a8c67f026397 SHA-256: e028ed0ab22e145006ef7b06c7af0756ad782dfa837cb85ae4705f29bc3337c0
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to malicious infrastructure, specifically promoting 'free generators' and 'game hacks'. The primary malicious URL identified is https://netcdn.tw/app/431946152/20210-robux-promo-code-free-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly indicate a phishing or scam attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://netcdn.tw/app/431946152/20210-robux-promo-code-free-game-hack In PDF document text
    • http://pustaka.fateta.unand.ac.id/repository/get-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.fateta.unand.ac.id/repository/free-robux-accounts_GM431946152.pdfIn PDF document text
    • http://pustaka.fateta.unand.ac.id/repository/minecraft-for-free-games_GM479516143.pdfIn PDF document text
    • http://pustaka.fateta.unand.ac.id/repository/free-minecraft-addons_GM479516143.pdfIn PDF document text
    • http://pustaka.fateta.unand.ac.id/repository/free-minecraft-videos_GM479516143.pdfIn PDF document text
    • http://pustaka.fateta.unand.ac.id/repository/free-spin-coin-master-instagram_GM406889139.pdfIn PDF document text
    • http://pustaka.fateta.unand.ac.id/repository/hacks-da-hood-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.fateta.unand.ac.id/repository/old-roblox-hack_GM431946152.pdfIn PDF document text
    • http://pustaka.fateta.unand.ac.id/repository/coin-master-spin-hack-apk_GM406889139.pdfIn PDF document text
    • http://pustaka.fateta.unand.ac.id/repository/coin-master-free-spins-without-human-verification_GM406889139.pdfIn PDF document text
    • http://pustaka.fateta.unand.ac.id/repository/coin-master-ios-gods-hack_GM406889139.pdfIn PDF document text
    • http://pustaka.fateta.unand.ac.id/repository/how-to-make-a-costume-for-free-in-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.fateta.unand.ac.id/repository/sk8r-roblox-free_GM431946152.pdfIn PDF document text
    • http://pustaka.fateta.unand.ac.id/repository/coin-master-attack-hack_GM406889139.pdfIn PDF document text
    • http://pustaka.fateta.unand.ac.id/repository/robux-giver_GM431946152.pdfIn PDF document text
    • http://pustaka.fateta.unand.ac.id/repository/roblox-download-free-chrome_GM431946152.pdfIn PDF document text
    • http://pustaka.fateta.unand.ac.id/repository/coin-master-hack-game_GM406889139.pdfIn PDF document text
    • http://pustaka.fateta.unand.ac.id/repository/coin-master-apk_GM406889139.pdfIn PDF document text
    • http://pustaka.fateta.unand.ac.id/repository/free-robux-come_GM431946152.pdfIn PDF document text
    • http://pustaka.fateta.unand.ac.id/repository/minecraft-bedrock-edition-download-pc-free_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004d12.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D12 28660 bytes
SHA-256: decae5598253dc8f2023852f6bff53f973780a4ac0ffcdcd5140eb37fe453ab8
font_01_sfnt_off00008f51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F51 2824 bytes
SHA-256: 94c1b019735d7e491765340abe50b2897410e2ec65ecf141c08bd9f2220897c4
font_02_sfnt_off00009900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9900 19004 bytes
SHA-256: 4385e50c3f64661886d3868e9ec76c8d603d5b462c4cfca5aea10ccd95d44e9a

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